Portable display device



FIG. 1 is a front perspective view of a portable display device in accordance with the new design;

FIG. 2 is the front view thereof;

FIG. 3 is the back view thereof;

FIG. 4 is the left side view thereof;

FIG. 5 is the right side view thereof;

FIG. 6 is the top view thereof; and,

FIG. 7 is the bottom view thereof. 

CLAIM The ornamental design for a portable display device, as shown and described. 